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CuSO(4) decolourises on addition of KCN,...

`CuSO_(4)` decolourises on addition of `KCN`, the product is

A

`Cu^(2+)` get reduced to form `[Cu(NH)_(4)]^(3-)`

B

`[Cu(CN)_(4)]^(2-)`

C

CuCN

D

`Cu(CN)_(2)`

Text Solution

Verified by Experts

The correct Answer is:
A
`CuSO_(4)+2KCN rarrCu(CN)_(2)+K_(2)SO_(4)`
`underset("unstable")(Cu(CN)_(2))hArr CuCNj+(1)/(2)(CN)_(2)`
`CuCN+3KCNhArr underset("colourless")(K_(3)[Cu(CN)_(4)]^(3-))`
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